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No necessarily electrical related but thought someone else might have come across this…

We are doing an office refurb and a couple of the sub floors are this black solid material ( was carpeted before), we need to sink some floor boxes in and run a channel across but don’t want to touch it without knowing what it is.

Can anyone help or point me somewhere where they may know?
What’s this black flooring? 9F380CFF-F5A3-4106-A634-E9BEE89AEC96 - EletriciansForums.netWhat’s this black flooring? 4A530D9B-3582-41DE-9B16-FF3B79DC6DFC - EletriciansForums.net
 
For some reason my brain is telling me it's black phenolic ply.

It most likely isn't but nobody has had a better idea. :D

Any obvious joins?
 
For some reason my brain is telling me it's black phenolic ply.

It most likely isn't but nobody has had a better idea. :D

Any obvious joins?
No, no joins. That’s the only reason I thought it wasn’t sheet material. It is a smooth surface though, isn’t phenolic ply textured?
 
once came across similar. there for 300 years. scraped off some of the 2" thick compound and the 12" thick floor which we thought was concrere turned out to be straw.
 
once came across similar. there for 300 years. scraped off some of the 2" thick compound and the 12" thick floor which we thought was concrere turned out to be straw.
I am very much hoping that’s not the case here! Been alright for 300 years though so can’t have been bad 😂
 
Depending on the age of the building, it could be a combined DPC and floor finish. Old council properties often had it as a way to level a rough concrete slab. It could also contain asbestos, so don't drill it if you are not sure!
 

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